I've been wondering. Some people say that one should learn from photographic reference. But some people say that you should learn from the symbols people draw (like eyes, mouths, trees, etc) and the way they draw these. But the people who learn from photographic reference often scoff at this.
What's so bad about learning to draw by means of the symbols experienced artists draw?
What's so much better about using photographic reference?
Is it such an unwise decision to learn from symbols?